Usually means: Unit of light output measurement.
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We found 52 dictionaries that define the word lumen:

General (17 matching dictionaries)
  1. lumen: Merriam-Webster
  2. lumen, lumen: Oxford Learner's Dictionaries
  3. lumen: American Heritage Dictionary of the English Language
  4. lumen: Collins English Dictionary
  5. lumen: Vocabulary.com
  6. Lumen, lumen: Wordnik
  7. lumen: Wiktionary
  8. lumen: Webster's New World College Dictionary, 4th Ed.
  9. lumen: The Wordsmyth English Dictionary-Thesaurus
  10. lumen: Infoplease Dictionary
  11. lumen: Dictionary.com
  12. Lumen (anatomy), Lumen (band), Lumen (biology), Lumen (branding agency), Lumen (disambiguation), Lumen (software), Lumen (superyacht), Lumen (unit), Lumen (web framework), Lumen (website), Lumen: Wikipedia, the Free Encyclopedia
  13. lumen: Rhymezone
  14. lumen: FreeDictionary.org
  15. lumen: The Phrontistery - A Dictionary of Obscure Words
  16. lumen: Mnemonic Dictionary
  17. lumen: TheFreeDictionary.com

Art (3 matching dictionaries)
  1. lumen: Global Glossary
  2. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)
  3. lumen-: A Cross Reference of Latin and Greek Elements

Business (2 matching dictionaries)
  1. Lumen: Energy Dictionary
  2. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. lumen: CCI Computer
  2. Lumen (unit), lumen: Encyclopedia

Medicine (11 matching dictionaries)
  1. lumen: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Lumen: MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. Lay Terms for Consent Forms (No longer online)
  6. Probert Encyclopaedia of Medicine (No longer online)
  7. Hepatitis C Information Central (No longer online)
  8. lumen: Dictionary of Cancer Terms
  9. lumen: Medical dictionary
  10. Lumen: Drug Medical Dictionary
  11. Hyperdictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. LUMEN: Acronym Finder
  2. AbbreviationZ (No longer online)

Science (6 matching dictionaries)
  1. Drug Discovery and Development (No longer online)
  2. Lumen: Eric Weisstein's World of Physics
  3. Botanical Terms (No longer online)
  4. Bryological (No longer online)
  5. Lumen: Extragalactic Astronomy
  6. How Many? A Dictionary of Units of Measurement (No longer online)

Slang (1 matching dictionary)
  1. lumen: Urban Dictionary

Tech (8 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. lumen: Lighting Design Glossary
  3. Dairy Glossary (No longer online)
  4. Energy Terms (No longer online)
  5. Glossary of Meteorology (No longer online)
  6. Glossary of video terms (No longer online)
  7. Glossary of Energy Terms (No longer online)
  8. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

(Note: See lumenal as well.)

Definitions from Wiktionary (lumen)

noun:  (physics) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
noun:  (anatomy) The cavity or channel within a tube or tubular organ.
noun:  (botany) The cavity bounded by a plant cell wall.
noun:  (medicine) The bore of a tube such as a hollow needle or catheter.

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